Scope modules created by defparams to defining module namespace

[jgautsch]

I ran into an issue with calling defparams with the same param schema name in different controllers. This PR makes doing so possible, which I think is convenient because needing to fully type out a unique name for every parameter schema seems needlessly restrictive (especially in a large app with many resources/controllers).

This PR allows for the following usage, which previously wouldn't compile, because both controllers would try to create a Params.CreateParams module:

defmodule MyApp.UserController do
  ...
  defparams create_params %{first_name: :string} # It's convenient to match param schema names with controller action names
  
  def create(conn, params), do: text(conn, "created")
end

defmodule MyApp.OrganizationController do
  ...
  defparams create_params %{employees: :integer}

  def create(conn, params), do: text(conn, "created")
end

Now the defparams line in each controller will define Params.MyApp.UserController.CreateParams and Params.MyApp.OrganizationController.CreateParams modules, respectively.

Feedback appreciated, thanks for the great project.

[jgautsch]

CI seems to be failing due to a couple of failed wgets rather than the tests (I don't see a way to re-run)

[take-five]

@vic if you don't have objections, I'll merge this in 24 hours.

[take-five]

Note: this change will entail in minor version increase

[jgautsch]

@vic @take-five If there are no objections to address would you mind merging and cutting a release when you have a chance? Thanks again.

[take-five]

@jgautsch Version 2.1.0 is released